Nowadays there has to be a dialogue between a patient and his doctor when it comes to the use of his personal data. Both parties have to work in common in order to achieve a joint management of the patient’s health: the patient gives enough information about his condition for the doctor to come up with a diagnostic and, as a counterpart, the doctor informs his patient of his health condition and the treatments he intends to use. With the development of new technologies such as Internet, the problem of the transmission of personal information has taken greater proportions. The author studies this new relation between a doctor and his patient when it comes to the processing of his personal data as described, in part, by the European Directive 95/46/CE. As “responsible of the treatment” the Directive imposes the doctor a few duties concerning the processing we mentioned earlier. The patient, as a “concerned person”, has fundamental rights on that matter. Furthermore he determines, in collaboration with his doctor, the way the processing is going to be done.